You should wait 20 to 30 minutes after a meal (especially if it is acidic) before brushing your teeth, because immediate brushing risks wearing down enamel that has been temporarily weakened by acidity.

noli's read

This recommendation is based on solid principles of oral physiology and enamel protection. An in situ study (a rigorous experimental protocol measuring actual wear in the mouth) conducted by Dr. Attin and published in the journal Caries Research demonstrates that brushing immediately after an acid attack significantly increases enamel loss compared to delayed brushing. The acidity of foods and drinks temporarily softens the tooth surface, making it vulnerable to the mechanical friction of the brush. Official recommendations from institutions such as the American Dental Association (ADA), based on expert consensus, even suggest waiting up to 60 minutes after consuming highly acidic foods. This delay allows saliva to play its role as a natural shield by neutralizing acidity and providing the minerals necessary for fortifying the enamel. The creator's advice is therefore perfectly accurate and scientifically validated.

the sources

No named source held this one up — that absence is part of the verdict.